Allow graphing of calculated columns or add calculated fields to hour objects

[#1]

Hours are one of the most useful report types, but you can't calculate values on hour report graphs or directly add calculated fields to hour objects. If your hours are a mix of general/project/task and issue types it become impossible to group and graph on the data.

The ability to add calculated fields to all hours in the system or aggregate calculated columns onto a report would help immensely.

[#2]

Having the ability to add custom fields on the hours object would definitely be nice to have.